Increase max compilation rate for Filebeat modules tests (#9777)

Module tests started to fail with the following message:

```
Too many dynamic script compilations within, max: [75/5m]; please use indexed, or scripts with parameters instead; this limit can be changed by the [script.max_compilations_rate] setting
```

The reason for this is (I think) that we started to use scripts more heavily in our pipelines so we hit this limit. For the tests we can easily increase the limit to solve this. In production this could still be an issue when all pipelines are loaded at the same time and we need to find a solution here.

In parallel we should also investigate if there are some non parameterised scripts which get recompiled every time.

* This also updates a generated Postgres file which was not updated properly.

filebeat/module/postgresql/log/test/postgresql-9.6-new-timestamp.log-expected.json

@@ -3,74 +3,69 @@
         "@timestamp": "2017-07-31T13:36:43.000Z", 
         "event.dataset": "log", 
         "event.module": "postgresql", 
+        "event.timezone": "EST", 
         "input.type": "log", 
+        "log.level": "LOG", 
         "log.offset": 0, 
-        "message": "2017-07-31 13:36:43 EST [835-1] LOG:  autovacuum launcher started", 
-        "postgresql.log.core_id": "1", 
-        "postgresql.log.level": "LOG", 
-        "postgresql.log.message": "autovacuum launcher started", 
-        "postgresql.log.thread_id": "835", 
+        "message": "autovacuum launcher started", 
+        "postgresql.log.core_id": 1, 
         "postgresql.log.timestamp": "2017-07-31 13:36:43", 
-        "postgresql.log.timezone": "EST"
+        "process.pid": 835
     }, 
     {
         "@timestamp": "2017-07-31T13:36:44.000Z", 
         "event.dataset": "log", 
         "event.module": "postgresql", 
+        "event.timezone": "EST", 
         "input.type": "log", 
+        "log.level": "LOG", 
         "log.offset": 66, 
-        "message": "2017-07-31 13:36:44 EST [832-1] LOG:  checkpoints are occurring too frequently (25 seconds apart)", 
-        "postgresql.log.core_id": "1", 
-        "postgresql.log.level": "LOG", 
-        "postgresql.log.message": "checkpoints are occurring too frequently (25 seconds apart)", 
-        "postgresql.log.thread_id": "832", 
+        "message": "checkpoints are occurring too frequently (25 seconds apart)", 
+        "postgresql.log.core_id": 1, 
         "postgresql.log.timestamp": "2017-07-31 13:36:44", 
-        "postgresql.log.timezone": "EST"
+        "process.pid": 832
     }, 
     {
         "@timestamp": "2017-07-31T13:46:02.000Z", 
         "event.dataset": "log", 
         "event.module": "postgresql", 
+        "event.timezone": "EST", 
         "input.type": "log", 
+        "log.level": "HINT", 
         "log.offset": 164, 
-        "message": "2017-07-31 13:46:02 EST [832-2] HINT:  Consider increasing the configuration parameter \"max_wal_size\".", 
-        "postgresql.log.core_id": "2", 
-        "postgresql.log.level": "HINT", 
-        "postgresql.log.message": "Consider increasing the configuration parameter \"max_wal_size\".", 
-        "postgresql.log.thread_id": "832", 
+        "message": "Consider increasing the configuration parameter \"max_wal_size\".", 
+        "postgresql.log.core_id": 2, 
         "postgresql.log.timestamp": "2017-07-31 13:46:02", 
-        "postgresql.log.timezone": "EST"
+        "process.pid": 832
     }, 
     {
         "@timestamp": "2017-07-31T13:46:23.000Z", 
         "event.dataset": "log", 
         "event.module": "postgresql", 
+        "event.timezone": "EST", 
         "input.type": "log", 
+        "log.level": "FATAL", 
         "log.offset": 267, 
-        "message": "2017-07-31 13:46:23 EST [768-1] postgres@postgres FATAL:  the database system is starting up", 
-        "postgresql.log.core_id": "1", 
+        "message": "the database system is starting up", 
+        "postgresql.log.core_id": 1, 
         "postgresql.log.database": "postgres", 
-        "postgresql.log.level": "FATAL", 
-        "postgresql.log.message": "the database system is starting up", 
-        "postgresql.log.thread_id": "768", 
         "postgresql.log.timestamp": "2017-07-31 13:46:23", 
-        "postgresql.log.timezone": "EST", 
-        "postgresql.log.user": "postgres"
+        "process.pid": 768, 
+        "user.name": "postgres"
     }, 
     {
         "@timestamp": "2017-07-31T13:46:55.000Z", 
         "event.dataset": "log", 
         "event.module": "postgresql", 
+        "event.timezone": "EST", 
         "input.type": "log", 
+        "log.level": "FATAL", 
         "log.offset": 360, 
-        "message": "2017-07-31 13:46:55 EST [771-1] postgres@postgres FATAL:  the database system is starting up", 
-        "postgresql.log.core_id": "1", 
+        "message": "the database system is starting up", 
+        "postgresql.log.core_id": 1, 
         "postgresql.log.database": "postgres", 
-        "postgresql.log.level": "FATAL", 
-        "postgresql.log.message": "the database system is starting up", 
-        "postgresql.log.thread_id": "771", 
         "postgresql.log.timestamp": "2017-07-31 13:46:55", 
-        "postgresql.log.timezone": "EST", 
-        "postgresql.log.user": "postgres"
+        "process.pid": 771, 
+        "user.name": "postgres"
     }
 ]

filebeat/tests/system/test_modules.py

@@ -67,6 +67,14 @@ def init(self):
 
         self.index_name = "test-filebeat-modules"
 
+        body = {
+            "transient": {
+                "script.max_compilations_rate": "1000/1m"
+            }
+        }
+
+        self.es.transport.perform_request('PUT', "/_cluster/settings", body=body)
+
     @parameterized.expand(load_fileset_test_cases)
     @unittest.skipIf(not INTEGRATION_TESTS,
                      "integration tests are disabled, run with INTEGRATION_TESTS=1 to enable them.")